Controlling device



Oct. 25, 1938. J. 1. HULSHIZER CONTROLLING DEVICE Filed Oct. 7, 1937 INVENTOR I H IS ATTORNEY.

Patented Oct. 25, 1938 UNITED STATES oFFrcE 2.134.405 f CONTROLLING DEVICE .Joseph I. .Hulshizer, :Stewartsville; H. 11 rassiinot.

to .Ingersoll-Rand Company, .Jersey-.0ity,, NQJ 7 a corporation of New Jersey U Application October "'1, 1937, SeriaLNo. 1675712 4:01aims. (Gl.'.:188+-3-1;)

This invention relates to controlling devices, andmore particularly to a controlling device for .a rotatable member.

One object of the invention is to selectively control the direction .ofrotation of the rotatable member. Another object is to prevent unauthorized rotary movement of the .rotatable member.

..Otherfobjec'ts will be in part obvious .andin part pointed out hereinafter.

In thedrawing accompanying this specification and in which similar reference numerals refer to similar parts,

Figure .1 is a longitudinal elevation, partly broken away, of a .rock drilling mechanism equipped with a controllingdevice constructedin accordance with the practiceof the invention,

Figure .2 is a longitudinal .elevation, in section, of the controlling device, and

Figures 3 and 4 are transverse views taken through Figure 2 on the lines 3--3 amid-4,, respectively.

Referring more particularly .to the drawing the invention is shown embodied in .a drilling mechanism comprising a rock drill, only a portion of the cylinder .20 and its piston 2;|$being shown, a shell 22 serving asa support for the :rock drilLa feed screw 23 and afeedcontrolling mechanism 24 secured to the rear end of the shell 22. v

The feed screwis in threaded engagement with a feed nut 25 carried by the cylinder 20, and the threads of the ieed.screw and the feed nut are of such inclination thatthe feed screwmay be readily rotated by moving the rock drill longitudinally of the shell. The front end of the feed screw 23 may be journaled, in a well-known manner, in the corresponding end of the shell, andtherear end of the feed screw extends into a casing '26 of the 'feed controlling mechanism 24 secured to the rear end of the shell by bolts 21.

The casing 26 is preferably of cup-shape, having a bore 28 of which the front end is closed by a'cover plate 29 and contains a bushing 30 to form a bearing for the feed screw 23. An additional bearing is provided for the rear end of the feed screw 23 by a bushing 3| seated in the casing 26.

On the portion of the feed screw 23 lying between the bearings 30 and 3| is an enlargement 32 having arranged therein two sets of pawls 33 and 34 which are urged outwardly by springpressed plungers 35 slidable in the enlargement 32. The sets of pawls 33 and 34 incline in different directions and are respectively adapted to engage, introverted teeth 36' onrraitchet rings 31 and "38 encircling the-enlargement 32. The ratchet rings3l and 38 are freely. rotatable in the bore '28 andare centralized by the -enlargement :32 of; whichthe "peripheral -surf ace engages thecreSts-Ottheteeth=36;

Means are provided;"to-selectively lock the ratchetrings in" fixed position, yeither singly or collectively, depending upon-whether it be desired to-eifectrotary movement of the feed-screw orto hold -it immovable. The-ratchet rings are accordingly-provided on "their peripheries with a series-0'1 clutch--members 39, and in the casing "26; is 'a plunger 40 havinga. -head-4 to 'inter- "lockingly enga e the clutch members. 39 and hold the ratchet rings stationary, thereby; enabling' the teeth of the "ratchet rings to serve as abutments for the pawls 33 and'34;

The-head. 4| has'opposedfiat surfaces '42 which 'slidably-engage-simi1arfisurfaces 43 in thecasing 20 26 to prevent" rotary movement of the'plunger. The surfaces 43 form the sides of a slot 44" in "the ;casing--26 and"extending'-from one end of the bore 28-into which-it opens "so that the head 4 I may' sli'de into engagement-with the clutch mem- 25 bers 39 of the ratchetring 38 or thus onthe "periphery:ofrthe ratchet ring 3'l orboth;

Thepstem -fl of the :plunger 40 is of generally cylindrical shape. It extendstslidably through 'abore 4li-inthegcasing '26"andfhasaportionpro- 3 jectingexteriorly of "the casing to accommodate 'aybuttonffl which may be grasped'by the operfator *for shifting the, plunger into engagement with the clutch "members,

' Tothe-endthat theiplunger lltmay be located finpthe various positions" of engagement :of the head"4.| with the 'clutc'h'members, the stem 45 is provided with a seriespfannular grooves, three in'the,presentinstance, designated 48, 4'9 and 50, to" receivethe end of a spring-pressed-plunger 51 arranged in the casing 26. The grooves are so positioned that the plunger 5| engages the groove when the head .5| is inengagement with the clutch members on the ratchet ring 38, and when the plunger is shifted to carry the head 4| into engagement with the clutch members of the ratchet ring 31 the plunger 5| will seat into the groove 48 for holding the plunger 40 in engagement with the clutch members.

The groove 49 is located between the grooves 48 and 50 and receives the plunger 5| to retain the head 4| in an intermediate position in which it interlockingly engages the clutch members of both ratchet rings.

During the operation of the device the force shock is imparted to the cylinder and moves the rock drillin the direction of the casing 26. e

In like manner, when thepiston reverses its direction" of movement in the front end of-the cylinder the jar tends to carry the rock drill in the direction of the work and in the absenceof suitable restraining devices will rotatethe feed screw 23.

the correct striking distance of the working implement the plunger is moved inte engagement with the clutch members of the ratchet ring 31 and is held thus by the plunger 5| which-then engages the groove".-

r H During the subsequent, operation of the rock drill the jars resulting uponreversal of the piston in the frontend of-the cylinder and acting against the casing of the rock drill cause the feed screw to turn in a counter -clockwise direction, as viewed fromtheright hand ends of Figures 1 and 2. The pawls 33 will, during the rotary movement of the feed screw in the direction described, pass over the crests of the adjacent ratchet teeth 36 and will be constantly in position to engage a ratchet tooth.-; At the end of the return stroke of the piston 2| a similar jar is imparted to the rock drillcasing but will be ineffective to disturb the position of the feed screw for the reason that the pawls 33 will then abut ratchet teeth 36 of the ratchet ring 31 to prevent retrograde movement of the rock drill. V l e The parts controlling the action of the feed screw continue to function in: the manner de scribed until the rockdrillhasadvanced to the front; end of the shell 22.. The plunger 40 is then shifted to the position illustrated in Figure 2 in which the head 4! engages the clutch members of the ratchet ring 38 and, therefore, releases the ratchet ring 31. 5 I

In the new positionof the plunger the ratchet ring 38 is held stationary' and-its teeth form abutments for-the pawls 34 so that when .thepiston 2i reverses in the; front endof the'cylinder 20 the feed screw 23 will be held against'movement permitting further movement f the rock drill to:-

ward the work, However, at the end of .the subsequent rearvvard stroke of the piston 2! the jar applied to the rock drill and transmittedthrough the feed nut 25 to the feed screw causes the feed screw to rotatein a clockwise direction and thus permit the shock to carry the rock drill rear- Wardly along the shell 22.. The :delivery of repeated shocks or jars to the rockdrill by the Assuming, therefore, that it b edesired to advance the rock drillgt'owardthe workin order to maintain the percussive element within piston 2| will move the rock drill rearwardly to its initial position in a manner well understood.

In the event that it should be desired to hold the rock drill immovable with respect to the shell the plunger 40 is moved into an intermediate position in which the head 4| partly overlaps each ratchet ring and engages the clutch members of both.

I claim: I

1. In a controlling device, the combination of a casing and a rotatable member in the casing, a plurality of sets of spring-pressed pawls carried by the rotatable member, separate ratchet rings for each set of pawls encircling the member and beinglfreely rotatable in the casing, and means to hold the ratchet-rings singly or, collectively immovable to provide abutments for the pawls for controlling the direction of rotation of the rotatable member or to prevent rotation of the rotatable member.

2. In a controlling device, the combination of a casing and 'a rotatable member in the casing, a plurality of sets of spring-pressed pawls carried by the rotatable member, separate ratchet rings foreach'setof pawls arranged on the rotatable member and being freely rotatable in the casing, clutch members on the ratchet rings, and means movable selectively into engagement with the clutch members to hold said clutch members stationary and thereby provide abutments for the pawls for controlling the direction of rotation of the rotatable member and to prevent rotation of the rotary member.

3. In a controlling device, the combination of a casing anda rotatable member in the casing, a plurality of sets of spring-pressed pawls carried bythe rotatable member, separate ratchet rings for each set of pawls arranged on the rotatable member and being rotatable with respect to the casing and the rotatable member, clutch members on the peripheries of the ratchet rings, and a plunger slidable in the casing to difierent positions to engage the clutch members to hold the ratchet rings immovable and thereby provide abutments for the pawls for controlling the direction of rotation of the rotatable member and being slidable to another position to interlockingly 

